/Engine/Plugins/Runtime/ModelViewViewModel/Source/ModelViewViewModel/Public/View/MVVMViewClass.h
The unique name of the source object that contains the SourceFieldId. It implementsINotifyFieldValueChangedif it's not a One Time. It can also be the name of aFPropertyon the source object.
[FName](API\Runtime\Core\UObject\FName) GetSourceName() const